Drill-sharpening machine.



J. H. & H. L SINCLAIR.

DRILL SHARPENING MACHINE, APPUCATION FILED JAN.I9,1916.

1,212,576. Patented Jan. 16,1917.

2 SHEETS.SHEET L IN VEN'IORS,

J. H. & H. L. SINCLAIR.

DRILL'SHARPENING MACHINE.

APPLICATION FILED JAN.19' 1916.

1,212,576. Patented Jan.16,191 7.

2 SHEETSSHEET 2- WITNESSES: v

TEE STATES PATENT oEETcE;

DRILL-SHARPENING MACHINE.

To all whom it may concern Be it known that we, JAMEsH. SINCLAIR and HARRY L. SINCLAIR, citizens of the United States, residing at. Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Drill Sharpenin-g Machines,

of which the following is a specification.

Our invention relates to improvements in drill sharpeners and more particularly to the means employed for guiding and retaining the spring-pressed dolly which in'the operation of the sharpener strikes the end of a drill-steel for forming the cutting edges thereon. I

In drill-sharpeners as heretofore used, the

means for guiding and retaining the dolly and its spring, were inadequate in many respects and more particularly in that their adjustment or replacement in case of wear or breakage, involved difliculties which especially at locations remote from a repair shop would incapacitate the machine for periods of considerable length.

It is the primary object of the present invention to provide in a drill sharpening machine, a device of simple, strong and durable construction which normally maintalns the dolly and the therewith associated spring in their operative position and which 7 is capable of instant adjustment to remove or replace these parts of the machine.

An embodiment of our invention is illustrated in the-accompanying drawings in the various views of which like parts are similarly designated, and in which,

Figure 1 is an elevation partially in sec- 'tion of a drill-sharpening machine to which our invention is applied, Fig. 2, a sectional view of the parts of the machine on which the dolly is mounted, drawn'to an enlarged scale, Fig. 3, a face view of the retaining Specification of Letters Patent. I

Patented Jan. 16, 191 *7.

Application filed January 19, 1916. Serial No. 72,960.

for the dolly and other operating parts of the machine.

The chuck consists as usual of 'a pair of relatively adjustable jaws which clamp a drillsteel to be sharpened, in a position in which it is axially alined with the reciprov eating dolly mounted upon the support 5.

The'dollyv 6 as it is usually constructed, is composed of head 7 having in its outer face, cutting edges 8 which are the counterpart'of those at the end of the drill-steel. The head is formed at the end of'an .elongated body 9 of polygonal sectionand of reduced diameter, which at its opposite end terminates in a still further reduced shank 10. A collar 12 formed at the point of juncture of the shank 10 and the body 9 provides an'abutment for a spring 13 coiled around the body portion of the dolly for its return movement in the operation of the machine, and the collar has a slanting peripheral groove l4 through which the spring is turned to place it in its operative position. The dolly is mounted for reciprocation in the end of a cylinder 15 which isfixed on a block 16 secured'to the support'5. The cylinder has in its forward end, a chamber 17 to receive the body and collar of the dolly and the spring 13, and it has between said chamber and a piston chamber 18, a bore 19 of reduced diameter in which the shank 10 of "the dolly is slidably fitted- A hammer 20 mounted for-reciprocation in the cylinder, engages the end of the dolly to drive it forwardly against the action of its spring into engagementwith the drill-steel held in the chuck of the machine, when fluid under pressure is admitted to the cylinder chamber from a source with which it is connected by means of a valve-controlled conduit 21.

The machine carries in addition to the cylinder 15, a cylinder 22 which is mounted at the upper end of the block 10 for the operation of a fullering tool 23, and a cylinder 24 which operates the moving jaw of the chuck, it being understoodthat all the cylinders are connected with one and the same source of fluid pressure supply.

The guiding and retaining device which maintains the dolly and its spring in their operative positions'in the end of the cylinder, consist of a pair of cooperative blade members 25 of like configuration which normally engage along one of their longitudinal edges. The members have at one of. their ends, lapping knuckles 37 by means of which they are hinged upon the end of one of a plurality of stud-bolts which are fixed on the support 5 and extend through bores in the block 16 upon which the cylinder is mounted. Nuts 26 screwed upon the stud 27 upon which the members 25 are pivotally mounted, secure the parts against relative displacement, and a concentric boss 28 formed on the knuckle of one of the blades, occupies a corresponding recess in the knuckle of the other blade to maintain the parts of the hinge in axial alinement. The members 25 have in their normally engaging edges, complementary recesses 29 forming conjointlyra passage which in contour corresponds with the cross sectional form of the polygonal body 9 of the dolly. At the ends of the members opposite to those at which they are hinged upon'the stud-bolt 27, knuckles 30 are formed which like those at theirother ends, overlap one another when the members are in their closed position. The knuckles 30, however, have slots 31 extending inwardly from their peripheries which permit their being placed in a lapping position over a stud-bolt 32 disposed opposite to that upon which the members of the retaining device are pivotally supported. A locking member is provided to secure the members 25 against movement about their pivotal axis after they have been closed around the body of the dolly, and nuts 33 screwed upon the ends of the stud 32 with which the slotted knuckles of the device engage, are applied for the usual purpose of holding the dilierent parts against relative displacement. The locking member hereinbefore referred to consists of a plate which is provided with a hole to ad mit its placement over the end of the lastmentioned stud, and which is similar in form to the ends of the two members 25 in their closed position.

The locking member in its operative position lies against the outer faces of the members of the retaining device and it has at its 'end remote from that at which it connects with the stud-bolt 32, two laterally projecting lugs 34 which by engagement with the outer longitudinal edges of the members 25, lock them against outward motion about the axis of the bolt upon which they are pivotally mounted.

A plate 35 placed upon the stud-bolts be tween the retaining device and the face of the support 5, covers the space between the cylinder 15 and the bore of the support into which it extends and it provides at the same time a smooth bearing surface for the blade members 25.

In the operation of 1 a drill-sharpening machine to which our invention is applied, the coiled spring 13 is placed around the body portion of the dolly by winding it of the retaining device which previously had been placed in the separated condition shown in Fig. i, are closed together around the body of the dolly and against the forward end of the spring 13 and they are subsequently secured in their closed position by means of ,2;

the locking plate 36 and the nut 33 on the stud-bolt upon which the plate is placed. The dolly being thus slidably fitted in the registering recesses of the two members 25,

is uided thereb in its reci arocatin motion while it is retained in its operative position by the engagement of the spring 13 with the inner surface'of the same. When air is admitted to the cylinder 15, the dolly is driven forwardly by the impact of the reciprocating air-impelled hammer 20, and the spring 13 is during each forward movement of the dolly, compressed against the inner surface of the retaining device to compel the same to follow the rearward motions of the hammer when it is released from pressure.

Having thus described the !mechanical construction and operation of our improved retaining device, we desire it understood that modifications required to adapt it to machines of different construction and to dollies of different shapes and sizes, may be resorted to within the spirit of our invention as set forth in the following claims:

1. In a drill-sharpening machine, the com bination with a support and a dolly mounted thereon, of a guiding and retaining device comprising two members hinged on said support'and having complementary recesses which in the closed position of said members provide a passage for a part of said dolly. V

2. In a drill-sharpening machine, the combination with a support and a dolly mounted thereon, of a guiding and retaining device comprising two members hinged on said support and having complementary recesses which in the closed position of said members provide a passage for a part of said dolly, and a third member for locking the first-mentioned members in their said closedposition.

3. In a drill-sharpening machine, the com-- bination with a support and a dolly mounted thereon, of bolts on said support at op posite sides of said dolly, and a guiding and retaining device comprising two members pivoted on one of said bolts, the said members having complementary recesses which in the closed position 01' the members provide a passage for a part of said dolly, and slots adapted to admit the other bolt, and a third member mounted on the lastmentioned bolt in engagement with opposite edges of said members to lock them in their said closed position. 7

4. In a drill-sharpening machine, the combination with a support and a dolly mounted thereon, of bolts on said support at opposite sides of said dolly, and a guiding and retaining device comprising two members pivoted on one of said bolts, the said mem bers having complementary recesses which in the closed position of the members provide a passage for a part of said dolly, and slots-adapted to admit the other bolt, and a third member mounted on the last-mentioned bolt in engagement with said members to lock them in their said closed position.

5. A device for guiding and retaining dollies of drill-sharpening machines comprising a pair of members hinged at one of their ends and having complementary recesses which in the closed position of said members provide a passage for a part of a dolly, and a third member adapted to lock the first-mentioned members in, their said closed position.

6. A device for guiding and retaining dollies of drill-sharpening machines comprising a pair of members hinged at one of their ends and having at their opposite ends slots to admit a bolt, the said members having complementary recesses which in the closed position of the members provide a passage for a part of a dolly, and a third member adapted to be placed on a bolt projecting through said slots of the first-mentioned members and having means for look ing said members in their said closed position.

7. In a drill-sharpening machine, the combination with a support, a dolly mounted thereon and a spring surrounding said dolly, of a guiding and retaining device comprising two members hinged on said support and adapted to conjointly embrace a part of said dolly whereby to provide an abutment for said spring. Y

8. In a drill sharpening machine, the combination with a support, a dolly mounted thereon and a spring surrounding said dolly, of a guiding and retaining device comprising two members hinged on said support and adapted to conjointly embrace a part of said dolly whereby to provide an abutment for said spring, and a third member adapted to lock the first-mentioned members in their said embracin position.

9. A dolly for drill-sharpening machines comprising an elongated body and a collar at one end thereof, the said collar having a groove providing a passage for a coiled spring placed around said body. I

10. In a drill-sharpening machine, a support having a recess, a dolly movably mounted on said support and extending through said recess, a spring in said recess in engagement with said dolly, and a device guiding said dolly in its operative movement and closing said recess to provide an abutment for said spring, said device being slidingly mounted on said support for its removal from the dolly to an inoperative position.

11. A drill-sharpening machine comprising a stationary support having a recess opening in a face thereof, a dolly movable in said recess, a spring in said recess in engagement with a shoulder on the dolly, and a device normally positioned to provide an abutment for the spring, and pivoted upon said face of the support for sliding movement to and from its said normal position.

- 12. A drill-sharpening machine comprising a stationary support having a recess opening in a face thereof, a dolly movable in said recess, and a device normally positioned to guide said dolly in its said movement and pivoted upon said face of the support for sliding movement to and from its said normal position.

In testimony whereof we have affixed our signatures in presence of two witnesses.

JAMES H. SINCLAIR. HARRY L. SINCLAIR. Witnesses:

G. J. ROLLANDET, L. RHoADns.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents,

Washington,]) 0. 

